WO2009157550A1 - 作動油の汚染度検出装置 - Google Patents
作動油の汚染度検出装置 Download PDFInfo
- Publication number
- WO2009157550A1 WO2009157550A1 PCT/JP2009/061751 JP2009061751W WO2009157550A1 WO 2009157550 A1 WO2009157550 A1 WO 2009157550A1 JP 2009061751 W JP2009061751 W JP 2009061751W WO 2009157550 A1 WO2009157550 A1 WO 2009157550A1
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- WO
- WIPO (PCT)
- Prior art keywords
- hydraulic oil
- contamination
- hydraulic
- contamination degree
- light
- Prior art date
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/226—Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/08—Superstructures; Supports for superstructures
- E02F9/0858—Arrangement of component parts installed on superstructures not otherwise provided for, e.g. electric components, fenders, air-conditioning units
- E02F9/0883—Tanks, e.g. oil tank, urea tank, fuel tank
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2285—Pilot-operated systems
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/22—Hydraulic or pneumatic drives
- E02F9/2278—Hydraulic circuits
- E02F9/2296—Systems with a variable displacement pump
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/26—Indicating devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
- G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
- G01N21/534—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke by measuring transmission alone, i.e. determining opacity
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/794—With means for separating solid material from the fluid
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/86493—Multi-way valve unit
- Y10T137/86574—Supply and exhaust
- Y10T137/86622—Motor-operated
Definitions
- the present invention relates to a hydraulic oil contamination detection device that is provided in a hydraulic working machine such as a construction machine and detects the contamination degree of hydraulic oil contaminated by foreign matter that causes a malfunction of the hydraulic working machine.
- Hydraulic working machines are equipped with a hydraulic circuit including hydraulic equipment driven by hydraulic fluid, such as hydraulic actuators such as hydraulic motors and hydraulic cylinders, hydraulic pumps, spool valves and the like. Solid foreign matter is mixed in the hydraulic fluid flowing through the hydraulic circuit.
- the types of foreign matter include foreign matter (metal processing powder, foundry sand, dust, etc.) remaining in the hydraulic equipment, piping, and hydraulic oil tank when the hydraulic circuit is manufactured, and foreign matter generated inside the hydraulic circuit while the hydraulic circuit is in operation (Wear powder generated from sliding parts of hydraulic equipment, sludge generated by oxidation and deterioration of hydraulic oil, etc.), foreign matter entering the hydraulic system from the external environment during operation of the hydraulic circuit, entering the hydraulic circuit during maintenance and repair There is a foreign object.
- foreign matter having a particle size (5 to 50 ⁇ m) that is almost the same size as the clearance of the sliding part of a hydraulic device may cause the sliding part to wear abnormally or become stuck, resulting in malfunction of the hydraulic work machine. .
- the conventional hydraulic oil contamination degree detection device includes a light-shielding detector that detects foreign matter in the hydraulic oil.
- This light-shielding detector has a light emitting unit that irradiates the working oil flowing through the pipeline with laser light, and a light receiving unit that receives the laser light.
- the conventional contamination degree detection device is set so as to determine the contamination degree of hydraulic oil based on a change in the luminous intensity of the laser light received by the light receiving unit.
- the hydraulic oil contamination degree detection apparatus using the light-shielding detector may erroneously detect the plurality of foreign matters as one large foreign matter when the plurality of foreign matters are present in the laser beam at the same time. . This lowers the accuracy of determining the degree of contamination of hydraulic oil contaminated with foreign particles having a particle size that causes malfunction.
- the present invention has been made in consideration of the above-mentioned circumstances, and the purpose of the present invention is to detect the contamination detection accuracy of hydraulic fluid contaminated with foreign particles having a particle size causing malfunction of the hydraulic working machine. It is an object of the present invention to provide a hydraulic oil contamination degree detection device that can be improved even by using a simple and inexpensive light shielding detector.
- the hydraulic oil contamination degree detection device of the present invention is configured as follows.
- the hydraulic oil contamination degree detection device of the present invention detects foreign matter in hydraulic oil flowing through the hydraulic circuit of the hydraulic working machine with a detector, and uses the detection result.
- a hydraulic oil contamination detection device for determining a hydraulic oil contamination level, the filter being provided in a pipe line in the hydraulic circuit, and removing a foreign substance causing a malfunction of the hydraulic working machine from the hydraulic oil.
- a first light-shielding detector that detects the passage of foreign matter upstream of the filter, a second light-shielding detector that detects passage of foreign matter downstream of the filter, and a foreign matter by the first light-shielding detector.
- the first frequency determination means for determining the detection frequency of the second
- the second frequency determination means for determining the detection frequency of the foreign matter by the second light shielding detector
- the determination results of the first and second frequency determination means Above the filter based on both Characterized in that it comprises a determining contamination level determination means to the side of contamination degree, the.
- the contamination degree on the upstream side of the filter is determined based on the detection frequency of foreign matters on both the upstream side and the downstream side of the filter.
- the accuracy of detection of the degree of contamination of hydraulic oil contaminated with foreign particles having a particle size that causes the above malfunction can be improved even by using a light-shielding detector that has a simple structure and is inexpensive.
- the hydraulic oil contamination detection device is the hydraulic oil contamination detection device according to “[1]”, wherein the filter removes foreign matter from the hydraulic oil in the pilot line included in the hydraulic circuit. It may be characterized by being a pilot filter to be removed.
- the filter removes foreign matter from the hydraulic oil in the pilot line included in the hydraulic circuit. It may be characterized by being a pilot filter to be removed.
- the size of the pilot filter is selected so that the foreign matter having a granularity that causes a malfunction may be removed in order to surely prevent the hydraulic working machine from being difficult to control. That is, since the filter in the hydraulic oil contamination degree detection apparatus of the present invention uses an existing pilot filter in the hydraulic circuit, a cheaper hydraulic oil pollution degree detection apparatus can be realized.
- the light-shielding detector erroneously detects the plurality of foreign objects as a large lump of foreign objects. This erroneous detection is less likely to occur when the pipe is narrow and the flow rate is low.
- the pipe line in the pilot system hydraulic circuit is narrower than the pipe line in the drive system hydraulic circuit, and the flow rate of the flowing hydraulic oil is small.
- the first and second light shielding detectors are provided in the pipelines in the pilot system hydraulic circuit.
- the hydraulic oil contamination level detection device is the hydraulic oil contamination level detection device according to “[2]”, wherein the flow rate determination unit determines whether the discharge flow rate of the pilot line is equal to or lower than a predetermined flow rate.
- the contamination degree determining means is configured to perform a contamination degree determination when the flow rate determining means determines that the flow rate of the pilot line is equal to or lower than a predetermined flow rate. It may be a feature. Thereby, the detection accuracy of the contamination degree can be stabilized.
- the hydraulic oil contamination level detection device is the hydraulic oil contamination level detection device according to “[3]”, wherein the hydraulic circuit includes a pilot pump that supplies pressure oil to the pilot line.
- a rotational speed detector for detecting the rotational speed of the pilot pump, wherein the flow rate determining means determines whether the rotational speed detection result by the rotational speed detector is equal to or lower than a predetermined rotational speed. It may consist of determination means.
- the pilot pump When a constant displacement hydraulic pump is used as the pilot pump, the discharge flow rate of the pilot pump and the rotational speed are in a directly proportional relationship.
- determining whether the detection result of the rotation speed of the pilot pump is equal to or less than the predetermined rotation speed is the same as determining whether the discharge flow rate of the pilot pump is equal to or less than the predetermined flow rate.
- the hydraulic oil contamination degree detection device determines whether or not the pilot pump discharge flow rate is equal to or lower than a predetermined flow rate by determining whether or not the rotation speed of the pilot pump is equal to or lower than the predetermined speed. Whether or not the discharge flow rate is equal to or less than the predetermined flow rate can be accurately determined with a simpler configuration than when determining the discharge flow rate of the pilot pump by actual measurement.
- the hydraulic oil contamination degree detection device is the hydraulic oil contamination degree detection device according to any one of “[1]” to “[4]”, which detects the temperature of the hydraulic oil.
- the contamination degree determining means detects the temperature detected by the oil temperature determining means. When it is determined that the temperature is equal to or higher than a predetermined temperature, the contamination level may be determined to be determined.
- the hydraulic oil has a high viscosity at low temperatures, and bubbles are difficult to disappear. Bubbles are detected by the light-shielding detector.
- the hydraulic oil contamination degree detection device determines the pollution degree when the temperature of the hydraulic oil is equal to or higher than a predetermined temperature, so that the detection of the pollution degree can be prevented from being performed at a low temperature at which bubbles do not easily disappear. .
- the frequency of detection of bubbles by the light-shielding detector can be reduced, and therefore a decrease in the detection accuracy of the degree of contamination caused by bubbles can be prevented.
- the hydraulic oil contamination level detection device is the hydraulic oil contamination level detection device according to any one of “[1]” to “[5]”, which is determined by the contamination level determination unit.
- Maintenance time arrival judging means for judging whether or not the contamination degree judgment result has reached the upper limit pollution degree set in advance as the degree of contamination requiring maintenance, and the maintenance time arrival judging means determines that the pollution degree is the upper limit pollution degree.
- Maintenance time arrival notifying means for notifying that it has been determined that it has been reached may be further provided. According to the contamination degree detection apparatus of the present invention configured as described above, it is possible to contribute to performing maintenance of hydraulic oil at an appropriate time.
- the hydraulic oil contamination level detection device is the hydraulic oil contamination level detection device according to any one of “[1]” to “[6]”.
- a contamination progress speed judging means for estimating the progress speed of the pollution degree
- a maintenance time estimating means for estimating the maintenance time of the hydraulic oil based on the progress speed estimated by the pollution progress speed judging means
- the apparatus may further comprise an estimated maintenance time notifying means for notifying an estimation result of the maintenance time by the means.
- the contamination degree detection apparatus of the present invention configured as described above can also contribute to performing maintenance of hydraulic oil at an appropriate time.
- the present invention it is possible to improve the detection accuracy of the degree of contamination of hydraulic oil contaminated by foreign particles having a particle size causing malfunction of the hydraulic working machine even when a light-shielding detector having a simple structure and an inexpensive structure is used. It is possible to provide a contamination degree detection device for hydraulic oil that can be used.
- FIG. 1 is a schematic diagram of a hydraulic circuit of a hydraulic working machine including a hydraulic oil contamination degree detection device according to an embodiment of the present invention.
- FIG. 2 is a block diagram illustrating a configuration of a hydraulic oil contamination degree detection apparatus according to an embodiment of the present invention.
- FIG. 3 is a diagram showing a contamination degree progress speed function calculated by the contamination detection device for hydraulic oil according to an embodiment of the present invention.
- a hydraulic working machine such as a hydraulic excavator, includes a hydraulic motor that is a driving source for traveling and turning, and a hydraulic cylinder that drives a front working machine.
- a hydraulic cylinder 1 is drawn as a representative of those hydraulic actuators.
- the hydraulic cylinder 1 is driven by oil discharged from a main pump 3 that uses an engine 2 as a drive source.
- a control valve 4 is interposed between the main pump 3 and the hydraulic cylinder 1, and the flow of pressure oil guided from the main pump 3 to the hydraulic cylinder 1 is controlled by the control valve 4.
- the pressure oil pushed out from the hydraulic cylinder 1 is guided to the hydraulic oil tank 6 by the control valve 4 and the return pipe 5.
- the return pipe 5 and the hydraulic oil tank 6 are provided with a return filter 7 (full flow filter) and a suction filter 8 for removing foreign substances from the hydraulic oil, respectively.
- the control valve 4 is a spool valve that is switched by applying a pilot pressure.
- the pilot pressure is generated by the pilot valve 10 with the discharge pressure of the pilot pump 9 using the engine 2 as a drive source as the primary pressure.
- a pilot filter 12 for filtering hydraulic oil is also provided in a pipe line 11 (pilot line) for leading the primary pressure from the pilot pump 9 to the pilot valve 10.
- the size is selected so that foreign matters having a particle size (5 ⁇ m to 50 ⁇ m) that cause malfunction of the hydraulic excavator can be removed from the hydraulic oil. .
- the openings of the return filter 7 and the suction filter 8 are large enough to prevent the flow of a large amount of hydraulic fluid used in the drive system circuit, and larger than the pilot filter 12.
- the first and second light shielding detectors 21 and 22 are provided on the upstream side and the downstream side of the pilot filter 12, respectively.
- the first light-shielding detector 21A includes a light emitting unit 21a that irradiates the hydraulic oil flowing through the pipe line 11 with the laser light La and a light receiving unit 21b that receives the laser light La, and the light emitted from the light emitting unit 21a.
- the laser beam La is blocked by foreign matter in the hydraulic oil, the luminous intensity of the laser beam received by the light receiving unit 21b changes (decreases), and the state of the foreign matter is detected.
- the laser light La is irradiated in a direction orthogonal to the flow of the hydraulic oil, and the light receiving unit 21b receives the laser light La, converts the light intensity of the received laser light La into a light intensity signal Sla (electric signal), and outputs it.
- the second light-shielding detector 22 is also configured in the same manner as the first light-shielding detector 21, and a light emitting unit 22 a that irradiates the laser oil Lb to the hydraulic oil flowing through the pipeline 11 and the laser light. And a light receiving portion 22b for receiving Lb.
- the light receiving unit 22b receives the laser beam Lb, converts the luminous intensity of the received laser beam Lb into a luminous intensity signal Slb (electric signal), and outputs it.
- the light intensity signals Sla and Slb are input to the vehicle body controller 23.
- the vehicle body controller 23 includes a CPU, a ROM, a RAM, and the like, and operates according to a computer program stored in advance.
- the vehicle body controller 23 is set so as to function as first frequency determination means for determining the frequency of detection of foreign matter upstream of the pilot filter 12 based on the light intensity indicated in the light intensity signal Sla. Further, it is also set to function as a second frequency determination means for determining the detection frequency of the foreign matter downstream of the pilot filter 12 based on the light intensity indicated in the light intensity signal Slb.
- the first frequency determining means calculates the particle size of the foreign matter based on the luminous intensity at this time, and the luminous intensity of the laser light La is predetermined. The number of times that the luminous intensity falls below the predetermined luminous intensity within the time is counted, and the degree of contamination of the hydraulic oil for each of the preset particle size ranges of a plurality of types of foreign matters is determined.
- the second frequency determination means calculates the particle size of the foreign matter based on the light intensity when the light intensity of the laser Lb received by the light receiving unit 22b falls below a predetermined light intensity. The number of times the luminous intensity of the laser beam La falls below the predetermined luminous intensity within a predetermined time is counted, and the contamination degree of the hydraulic oil for each particle size range of the foreign matter is determined.
- the pilot pump 9 is provided with a rotation speed detector 24 that detects the rotation speed and outputs a rotation speed signal Sr (electric signal) corresponding to the detected rotation speed.
- the vehicle body controller 23 is set so as to function as a rotational speed determination unit that receives the rotational speed signal Sr and determines whether or not the detected rotational speed indicated by the rotational speed signal Sr is equal to or less than a predetermined rotational speed. Since the pilot pump 9 is a constant displacement hydraulic pump, the relationship is in direct proportion to the discharge flow rate and the rotational speed of the pilot pump 9.
- the rotation speed determination means constitutes a flow rate determination means for determining whether or not the discharge flow rate of the pilot pump 9 is equal to or less than a predetermined flow rate.
- the predetermined rotation speed is, for example, the rotation speed of the pilot pump 9 when the engine 2 is in a low idle state.
- the hydraulic oil tank 6 is provided with an oil temperature detector 24 that detects the temperature of the hydraulic oil and outputs an oil temperature signal St (electric signal) corresponding to the detected temperature.
- the vehicle body controller 23 is set to function as an oil temperature determination unit that receives the oil temperature signal St and determines whether the detected temperature indicated by the oil temperature signal St is equal to or higher than a predetermined temperature.
- the vehicle body controller 23 is set to function as a contamination degree determination means for determining the contamination degree on the upstream side of the pilot filter 12 based on both the determination results by the first and second frequency determination means. Since the opening of the pilot filter 12 is large enough to remove foreign particles having a particle size causing the malfunction of the hydraulic excavator from the hydraulic oil, the opening of the pilot filter 12 is larger than the particle size causing the malfunction of the hydraulic excavator on the upstream side of the pilot filter 12. A foreign object is detected, and on the downstream side, the frequency of detecting a foreign object larger than the particle size is reduced. The frequency of erroneous detection by the first light shielding detector 21 and the frequency of erroneous detection by the second light shielding detector 22 are substantially the same.
- the contamination degree determination means determines the contamination degree on the upstream side of the pilot filter 12
- the determination result by the first frequency determination means of the detection frequency of the foreign matter having a granularity that causes the malfunction of the hydraulic excavator is obtained. Therefore, the influence of the false detection of the first light-shielding detector 21 on the determination result of the contamination degree is calibrated by comparing the determination result by the second frequency determination means of the detection frequency of the foreign matter of the same granularity.
- the contamination degree determination means determines that the rotation speed of the pilot pump 9 is equal to or lower than the predetermined rotation speed by the rotation speed determination means, and determines that the detected temperature is equal to or higher than the predetermined temperature by the oil temperature determination means. Sometimes it is set to perform a pollution degree determination.
- the vehicle body controller 23 functions as a maintenance time arrival determination hand for determining whether the determination result of the contamination level by the contamination level determination means has reached the upper limit contamination level Cl set in advance as the upper limit of the contamination level that requires maintenance. It is set to be. Further, the vehicle body controller 23 controls the in-vehicle monitor 26 provided in the cab of the hydraulic excavator, and determines that the contamination level has reached the upper limit contamination level by the maintenance time arrival determining means. Is set to be displayed. That is, the vehicle body controller 23 and the in-vehicle monitor 26 constitute maintenance time arrival notifying means for notifying that the degree of contamination has reached the upper limit contamination degree by the maintenance time arrival determining means.
- the vehicle body controller 23 is set so as to function as a contamination progress speed determining means for estimating the progress speed of the pollution degree by comparing the pollution degrees at different time points, and the progress speed estimated by the contamination progress speed determining means. Is set to function as a maintenance time estimation means for estimating the maintenance time of hydraulic oil.
- the vehicle body controller 23 is configured to control the in-vehicle monitor 26 and to display a screen showing the estimation result of the maintenance time by the maintenance time estimating means on the in-vehicle monitor 26. That is, the vehicle body controller 23 and the in-vehicle monitor 26 constitute estimated maintenance time notifying means for notifying the estimation result of the maintenance time by the maintenance time estimating means.
- the contamination progress rate determination means calculates the contamination progress rate function A1 from these values.
- A1 (C2-C1) / (T2-T1)).
- the maintenance time estimation main means calculates the time point Ti1 obtained from the intersection I1 between the contamination progress function A1 and the upper limit contamination degree Cl, and then calculates the time “Ti1-T2” from the time point T2 to the time point Ti1. Then, the maintenance time is calculated from this time “Ti1-T2” and the date and time of the time T2 when the contamination degree is detected.
- the contamination progress speed function A1 is an example obtained at the time of quarrying with a hydraulic excavator, and the contamination progress speed function is not limited to the contamination degree progress speed A1, but varies depending on the environment and work content of the work site of the hydraulic excavator.
- the vehicle body controller 23 is communicably connected to the monitoring center device 27 via the antennas 28 and 29.
- the monitoring center device 27 generates a monitoring computer 27a for generating data for monitoring the state of the hydraulic excavator, various types of hydraulic excavator data transmitted from the vehicle body controller 23, and data generated by the monitoring computer 27a.
- An information server 27b for accumulation is provided.
- the various data includes a detection result by the first light shielding detector, a detection result by the second light shielding detector, a detection result by the rotation speed detector, a detection result by the oil temperature detector, and a determination result by the first frequency determination means.
- the determination result by the second frequency determination means, the determination result by the rotation speed determination means, the determination result by the oil temperature determination means, the determination result by the contamination degree determination means, the estimation result by the contamination progress speed estimation means, the estimation result by the maintenance time estimation means is included.
- the monitoring computer 27a can perform detailed analysis of the degree of contamination of hydraulic oil using data from the vehicle body controller 23.
- the monitoring center device 27 notifies the customer of the contamination progress speed, the estimated maintenance time, and the fact that the contamination degree of the hydraulic oil has reached the upper limit contamination degree Cl using a communication line.
- the contamination degree detection apparatus 20 According to the contamination degree detection apparatus 20 according to the present embodiment, the following effects can be obtained.
- the contamination degree detection device 20 determines the contamination degree on the upstream side of the pilot filter 12 based on the detection frequency of foreign matters on both the upstream side and the downstream side of the pilot filter 12, the granularity that causes the malfunction of the hydraulic excavator.
- the accuracy of detecting the degree of contamination of hydraulic oil contaminated with foreign matter can be improved even with a light-shielding detector that has a simple structure and is inexpensive.
- the first and second light shielding detectors 21 and 22 are installed on the upstream side and the downstream side of the pilot filter 12. That is, since the existing pilot filter in the hydraulic circuit of the hydraulic excavator is used, a cheaper hydraulic oil contamination degree detection device can be realized.
- the first light-shielding detector 21 and the second light-shielding detector 22 erroneously detect the plurality of foreign matters as a large lump of foreign matter when a plurality of foreign matters are present in the laser light La or Lb at the same time. This erroneous detection is less likely to occur when the pipe is narrow and the flow rate is smaller.
- the pipe line in the pilot system hydraulic circuit is narrower than the pipe line in the drive system hydraulic circuit, and the flow rate of the flowing hydraulic oil is small.
- the contamination degree detection apparatus 20 since the first and second light shielding detectors 21 and 22 are provided in the pipe line 11 in the pilot system hydraulic circuit, the first and second light shielding detectors are provided in the drive system hydraulic circuit. It is easier to obtain the degree of contamination detection than when 21 and 22 are provided, and it is possible to realize a contamination degree detection device that is less expensive than the case where a hydraulic line of a hydraulic excavator is provided with a dedicated pipe for the detector.
- the contamination degree detection device 20 includes a flow rate determination unit that determines whether or not the discharge flow rate of the pilot pump is equal to or lower than a predetermined flow rate.
- the contamination level determination unit is configured so that the discharge flow rate of the pilot pump 9 is equal to or lower than the predetermined flow rate. When it is determined that there is a contamination level, the contamination level is determined. Thereby, the detection accuracy of a contamination degree can be stabilized. Furthermore, since the predetermined flow rate is the flow rate of the pilot pump 9 when the engine 2 is at low idle, the foreign matter detection accuracy by the first and second light shielding detectors 21 and 22 can be stabilized in a high state.
- the contamination degree detection device 20 determines whether or not the discharge flow rate of the pilot pump 9 is equal to or less than the predetermined flow rate by determining whether or not the rotation speed of the pilot pump 9 is equal to or less than the predetermined rotation number. Whether or not the flow rate is equal to or lower than the predetermined flow rate can be accurately determined with a simpler configuration than when determining from the measured value of the discharge flow rate of the pilot pump 9.
- the contamination degree determination means when the temperature detected by the oil temperature detector 24 is determined to be equal to or higher than a predetermined temperature by the oil temperature determination means, the contamination degree determination means is set to determine the contamination degree.
- the hydraulic oil has a high viscosity at low temperatures, and bubbles are difficult to disappear.
- the bubbles are detected by the first and second light shielding detectors 21 and 22. Since the contamination level detection device 20 determines the contamination level when the temperature of the hydraulic oil is equal to or higher than a predetermined temperature, it is possible to prevent the contamination level from being determined at a low temperature at which bubbles are difficult to disappear. Thereby, the detection frequency of the bubble by the 1st, 2nd light shielding type detectors 21 and 22 can be reduced, Therefore, the fall of the detection accuracy of the contamination degree resulting from a bubble can be prevented.
- the contamination degree detection device 20 Since the contamination degree detection device 20 notifies the in-vehicle monitor 26 that the contamination degree of the hydraulic oil has reached the upper limit contamination degree Cl and the estimated maintenance time, it can contribute to performing the maintenance of the hydraulic oil at an appropriate time. .
- the vehicle body controller 23 has the first frequency determination means, the second frequency determination means, the rotation speed determination means, the oil temperature determination means, the contamination degree determination means, the contamination progress speed estimation means, the maintenance time estimation means, and Although it is set so as to function as the maintenance time arrival determination means, these means in the present invention are not limited to those that cause the vehicle body controller 23 to function, and some or all of these functions are monitored by the monitoring center.
- the device 27 may be set so as to fulfill.
- the rotational speed determination means uses the detection result by the rotational speed detector 24 in order to determine whether the rotational speed of the pilot pump 9 is equal to or lower than the predetermined rotational speed, but the present invention is not limited to this. It is not something. Whether the rotational speed of the pilot pump 9 is equal to or lower than a predetermined rotational speed by using a detection result by a rotational speed detector that detects the rotational speed of the engine 2 instead of the rotational speed detector 24 or a command value for the rotational speed to the engine 2. It may be set so as to indirectly determine whether or not.
- the first and second light shielding detectors 21 and 22 using laser light are used as the first and second light shielding detectors for detecting the foreign matter.
- the second light-shielding detector is not limited to the one using laser light, and a light-shielding detector using general light may be used.
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Abstract
Description
2 エンジン
3 メインポンプ
4 コントロールバルブ
5 戻り管路
6 作動油タンク
7 リターンフィルタ
8 サクションフィルタ
9 パイロットポンプ
10 パイロットバルブ
11 管路
12 パイロットフィルタ
20 汚染度検出装置
21 第1遮光式検出器
21a 発光部
21b 受光部
22 第2遮光式検出器
22a 発光部
22b 受光部
23 車体コントローラ
24 回転数検出器
25 油温検出器
26 車内モニタ
27 監視センタ装置
27a 監視用コンピュータ
27b 情報サーバ
28 アンテナ
29 アンテナ
Claims (7)
- 油圧作業機械の油圧回路を流れる作動油中の異物を遮光式検出器により検出し、その検出結果を用いて作動油の汚染度を判定する作動油の汚染度検出装置であって、
前記油圧回路中の管路に設けられていて、油圧作業機械の動作不良の原因となる異物を作動油から取り除くフィルタと、
前記フィルタの上流側で異物の通過を検出する第1遮光式検出器と、
前記フィルタの下流側で異物の通過を検出する第2遮光式検出器と、
前記第1遮光式検出器による異物の検出頻度を判定する第1頻度判定手段と、
前記第2遮光式検出器による異物の検出頻度を判定する第2頻度判定手段と、
前記第1,第2頻度判定手段のそれぞれによる判定結果の両方に基づいて前記フィルタの上流側の汚染度を判定する汚染度判定手段と、を備えていることを特徴とする作動油の汚染度検出装置。 - 請求項1に記載の作動油の汚染度検出装置において、
前記フィルタは、前記油圧回路に含まれるパイロットラインの作動油から異物を取り除くパイロットフィルタであることを特徴とする作動油の汚染度検出装置。 - 請求項2に記載の作動油の汚染度検出装置において、
前記パイロットラインの吐出流量が所定流量以下かどうかを判定する流量判定手段をさらに備えていて、
前記汚染度判定手段は、前記流量判定手段により前記パイロットラインの流量が所定流量以下であると判定されたときに、汚染度の判定を実行するよう設定されていることを特徴とする作動油の汚染度検出装置。 - 請求項3に記載の作動油の汚染度検出装置において、
前記油圧回路には前記パイロットラインに圧油を供給するパイロットポンプが含まれ、
前記パイロットポンプの回転数を検出する回転数検出器をさらに備えていて、
前記流量判定手段は、この回転数検出器による回転数の検出結果が所定回転数以下かどうかを判定する回転数判定手段とからなることを特徴とする作動油の汚染度検出装置。 - 請求項1~4のいずれか1に記載の作動油の汚染度検出装置において、
作動油の温度を検出する油温検出器と、この油温検出器による検出温度が所定温度以上かどうかを判定する油温判定手段と、をさらに備えていて、
前記汚染度判定手段は、前記油温判定手段により検出温度が所定温度以上であると判定されたときに、汚染度の判定を実行するよう設定されていることを特徴とする作動油の汚染度検出装置。 - 請求項1~5のいずれか1に記載の作動油の汚染度検出装置において、
前記汚染度判定手段により判定された汚染度の判定結果が、メンテナンスの必要な汚染度として予め設定された上限汚染度に達したかどうかを判定するメンテナンス時期到達判定手段と、
このメンテナンス時期到達判定手段により汚染度が上限汚染度に達したと判定されたことを報知するメンテナンス時期到達報知手段とを、さらに備えたことを特徴とする作動油の汚染度検出装置。 - 請求項1~6のいずれか1に記載の作動油の汚染度検出装置において、
異なる時点の汚染度を比較して汚染度の進行速度を推定する汚染進行速度判定手段と、
この汚染進行速度判定手段により推定された進行速度に基づいて、作動油のメンテナンス時期を推定するメンテナンス時期推定手段と、
このメンテナンス時期推定手段によるメンテナンス時期の推定結果を報知する推定メンテナンス時期報知手段とを、さらに備えていることを特徴とする作動油の汚染度検出装置。
Priority Applications (2)
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US13/001,573 US8812267B2 (en) | 2008-06-27 | 2009-06-26 | Device for detecting contamination level of operating oil |
EP09770260.9A EP2302223B1 (en) | 2008-06-27 | 2009-06-26 | Hydraulic circuit with device for detecting contamination level of operating oil |
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JP2008168807A JP5015077B2 (ja) | 2008-06-27 | 2008-06-27 | 作動油の汚染度検出装置 |
JP2008-168807 | 2008-06-27 |
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WO2009157550A1 true WO2009157550A1 (ja) | 2009-12-30 |
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PCT/JP2009/061751 WO2009157550A1 (ja) | 2008-06-27 | 2009-06-26 | 作動油の汚染度検出装置 |
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US (1) | US8812267B2 (ja) |
EP (1) | EP2302223B1 (ja) |
JP (1) | JP5015077B2 (ja) |
KR (1) | KR101600120B1 (ja) |
WO (1) | WO2009157550A1 (ja) |
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WO2016115509A1 (en) * | 2015-01-16 | 2016-07-21 | Fluidmatics, LLC | Hydraulic and lubricating fluid contamination sensor system |
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KR101918837B1 (ko) * | 2017-02-10 | 2018-11-16 | 대모 엔지니어링 주식회사 | 유압식 브레이커, 작동유 모니터링 시스템 및 작동유 모니터링 방법 |
JP7061504B2 (ja) | 2018-04-16 | 2022-04-28 | 株式会社小松製作所 | 作動油の監視システム及び作動油の監視方法 |
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US11156530B2 (en) * | 2019-09-23 | 2021-10-26 | Textron Innovations Inc. | System and method for mechanical system chip detection capability verification |
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JP5015077B2 (ja) | 2012-08-29 |
EP2302223B1 (en) | 2015-06-17 |
EP2302223A1 (en) | 2011-03-30 |
KR101600120B1 (ko) | 2016-03-04 |
KR20110038065A (ko) | 2011-04-13 |
JP2010007782A (ja) | 2010-01-14 |
US8812267B2 (en) | 2014-08-19 |
US20110153275A1 (en) | 2011-06-23 |
EP2302223A4 (en) | 2012-12-19 |
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